How to Install JDK in Linux

Method 1 of 2:

Press Ctrl+Alt+T to open a new terminal window. If you're already at the command prompt, just skip to the next step.
Type sudo add-apt-repository ppa:linuxuprising/java and press ↵ Enter. This adds the Linux Uprising repository.^[1]
Type sudo apt update and press ↵ Enter. Now that the repository is ready, you can use it to install JDK.
Type sudo apt install oracle-java12-installer and press ↵ Enter. JDK is now installed.
Type sudo apt install oracle-java12-set-default and press ↵ Enter. This sets Java 12 as the default Java version.
- To double-check the default version, type java --version at the command prompt and press ↵ Enter.

Method 2 of 2:

Press Ctrl+Alt+T to open a new terminal window. If you're already at the command prompt, just skip to the next step.
Type su - and press ↵ Enter.
Add the Linux Uprising repository. Here's how:
- Type echo "deb http://ppa.launchpad.net/linuxuprising/java/ubuntu bionic main" and press ↵ Enter.
- Type apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 73C3DB2A and press ↵ Enter.
Type apt-get update and press ↵ Enter.
Type apt-get install oracle-java12-installer and press ↵ Enter.
Type exit and press ↵ Enter. JDK is now installed.
Type sudo apt install oracle-java12-set-default and press ↵ Enter. This sets Java 12 as the default Java version.
- To double-check the default version, type java --version at the command prompt and press ↵ Enter.

This wikiHow teaches you how to install the latest version of JDK (Java 12) on Debian, Ubuntu, and Linux Mint using the Linux Rising PPA repository. Press to open a new terminal window. If you're already at the command prompt, just skip to...